Storage engines

InnoDB

Supports transactions, row-level locking, foreign keys and encryption for tables

[ Variables | Buffer Pool | InnoDB Status ]

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2026-09-27 15:01:58 0x5f10 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 64 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 8424 srv_active, 0 srv_shutdown, 9546 srv_idle
srv_master_thread log flush and writes: 17970
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 11627
OS WAIT ARRAY INFO: signal count 8138
RW-shared spins 4120, rounds 122472, OS waits 4026
RW-excl spins 277, rounds 2939, OS waits 72
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 29.73 RW-shared, 10.61 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 22581
Purge done for trx's n:o < 22581 undo n:o < 0 state: running but idle
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 284272359334248, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284272359330080, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284272359325912, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284272359321744, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
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FILE I/O
--------
I/O thread 0 state: native aio handle (insert buffer thread)
I/O thread 1 state: native aio handle (log thread)
I/O thread 2 state: native aio handle (read thread)
I/O thread 3 state: native aio handle (read thread)
I/O thread 4 state: native aio handle (read thread)
I/O thread 5 state: native aio handle (read thread)
I/O thread 6 state: native aio handle (write thread)
I/O thread 7 state: native aio handle (write thread)
I/O thread 8 state: native aio handle (write thread)
I/O thread 9 state: native aio handle (write thread)
Pending normal aio reads: [0, 0, 0, 0] , aio writes: [0, 0, 0, 0] ,
 ibuf aio reads:, log i/o's:, sync i/o's:
Pending flushes (fsync) log: 0; buffer pool: 0
17126 OS file reads, 85391 OS file writes, 53583 OS fsyncs
1.33 reads/s, 16384 avg bytes/read, 7.58 writes/s, 4.62 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
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Ibuf: size 1, free list len 0, seg size 2, 0 merges
merged operations:
 insert 0, delete mark 0, delete 0
discarded operations:
 insert 0, delete mark 0, delete 0
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
5.02 hash searches/s, 12.34 non-hash searches/s
---
LOG
---
Log sequence number 12817233
Log flushed up to   12816812
Pages flushed up to 12816812
Last checkpoint at  12814939
0 pending log flushes, 0 pending chkp writes
26778 log i/o's done, 2.30 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 102664
Buffer pool size   1003
Free buffers       737
Database pages     260
Old database pages 0
Modified db pages  20
Percent of dirty pages(LRU & free pages): 2.004
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 0, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 17083, created 454, written 49517
1.33 reads/s, 0.06 creates/s, 4.52 writes/s
Buffer pool hit rate 976 / 1000, young-making rate 0 / 1000 not 0 / 1000
Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 260, unzip_LRU len: 0
I/O sum[290]:cur[4], unzip sum[0]:cur[0]
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ROW OPERATIONS
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0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=31284, Main thread ID=33716, state: sleeping
Number of rows inserted 76, updated 10189, deleted 0, read 164643
0.00 inserts/s, 0.92 updates/s, 0.00 deletes/s, 29.30 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 12652
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
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END OF INNODB MONITOR OUTPUT
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